ScriptableRenderPipeline/MaterialGraphProject/Assets/NewNodes/Editor/BlendModeNodePresenter.cs

using System;
using System.Collections.Generic;
using UnityEditor.Experimental.UIElements.GraphView;
using UnityEngine.MaterialGraph;

namespace UnityEditor.MaterialGraph.Drawing
{
    [Serializable]
    class BlendModeNodeControlPresenter : GraphControlPresenter
    {
        public override void OnGUIHandler()
        {
            base.OnGUIHandler();

            var cNode = node as BlendModeNode;
            if (cNode == null)
                return;

            cNode.blendMode = (BlendModesEnum)EditorGUILayout.EnumPopup("", cNode.blendMode);
        }

        /*       public override float GetHeight()
               {
                   return EditorGUIUtility.singleLineHeight + 2 * EditorGUIUtility.standardVerticalSpacing;
               }
        */
        public override float GetHeight()
        {
            return EditorGUIUtility.singleLineHeight + EditorGUIUtility.standardVerticalSpacing + EditorGUIUtility.standardVerticalSpacing;
        }
    }

    [Serializable]
    public class BlendModeNodePresenter : MaterialNodePresenter
    {
        protected override IEnumerable<GraphControlPresenter> GetControlData()
        {
            var instance = CreateInstance<BlendModeNodeControlPresenter>();
            instance.Initialize(node);
            return new List<GraphControlPresenter> { instance };
        }
    }
}